Year	% (cumulative)
1970	0.946389973163605
1981	2.22368001937866
1991	7.20783996582031
1998	14.6150102615356
1999	15.1834096908569
2000	15.7540397644043
2001	16.5205993652344
2002	17.2281303405762
2003	19.0987796783447
2004	20.8849906921387
2005	22.1252593994141
2006	23.2225303649902
2007	23.289270401001
2008	23.7502098083496
2009	25.0210304260254
2010	26.9902400970459
2011	29.0934200286865
2012	31.3992691040039
2013	33.4777717590332
2014	35.9690704345703
2015	36.7011604309082
2016	38.0721817016602
2017	39.381031036377
2018	39.1118698120117
2019	42.2028999328613
2020	44.3904800415039
2021	48.6860847473145
2022	49.8363265991211